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Fair Value Measurements - Assets/Liabilities Measured at Fair Value (Details) - USD ($) shares in Thousands, $ in Thousands | Oct. 30, 2020 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |
Cash and cash equivalents |  | $ 23,774 | $ 21,100
Quoted Price in Active Markets for Identical Instruments Level 1 |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |
Cash and cash equivalents |  | 307 | 82
Significant Other Observable Inputs Level 2 |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |
Cash and cash equivalents |  | 23,467 | 21,018
Significant Unobservable Inputs Level 3 |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |
Cash and cash equivalents |  | 0 | 0
Processa Pharmaceuticals, Inc |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |
Processa common shares |  | 56 | 240
Processa Pharmaceuticals, Inc | Quoted Price in Active Markets for Identical Instruments Level 1 |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |
Processa common shares |  | 56 |
Processa Pharmaceuticals, Inc | Significant Other Observable Inputs Level 2 |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |
Processa common shares |  |  | 240
Processa Pharmaceuticals, Inc | Significant Unobservable Inputs Level 3 |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |
Processa common shares |  | $ 0 | $ 0
License agreement | Processa Pharmaceuticals, Inc | Restricted shares |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |
Shares to be issued under agreement | 41 |  |
License agreement | Processa Pharmaceuticals, Inc | Restricted shares | 6 month interval |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |
Expiration of share restriction | 50.00% |  |
Share Restriction Term | 6 months |  |
License agreement | Processa Pharmaceuticals, Inc | Restricted shares | 9 month interval |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |
Expiration of share restriction | 25.00% |  |
Share Restriction Term | 9 months |  |
License agreement | Processa Pharmaceuticals, Inc | Restricted shares | 12 month interval |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |
Expiration of share restriction | 25.00% |  |
Share Restriction Term | 12 months |  |

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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